LYON, France -- Interpol has released an image of two Iranians who were traveling with stolen passports on a missing Malaysia Airlines jetliner.

The image showed the two Iranian men boarding a plane at the same time. Interpol secretary general Ronald K. Noble said Tuesday the two men traveled to Malaysia on their Iranian passports, then apparently switched to the stolen Austrian and Italian documents.

Noble said the recent information about the men made terrorism a less likely cause of the plane's disappearance, but that did not allay concerns about the ease of travel involving stolen passports.

He said the passport birthdates indicated one was 19 and the other 29. The 19-year-old, whose name differed slightly from that given by Malaysian authorities, is believed to have planned to seek asylum in Germany.